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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361bbf86ca36f7b5663a1671560ff78ab1dab8a4b05b12b720732468fff73f1b' 
  AND token = 'GGzL9OC4DXg9WdrqNitjHRJVH7N880/X8qmJiD5qt2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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