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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdff75cfb30d09686f484fc93bd431c3ec4b4fe7aad3147d46dde41f60f46ed' 
  AND token = 'hT5tKUempozlwQjcbOopLyRGJ88DJESJnW92hdRBb5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}