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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b54367c14ce0ae1eb4a19e43c0a395747891164c4b0c07b100575331fc481b' 
  AND token = 'q6/3zLWOFnfonkhDiiUKvRg3R9Bv4MpaNRjIk0yygVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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