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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1763aead80c5e59c726bbe08b217e20195ff7657d53656c6cef00653830d75fb' 
  AND token = 'gR6iCweYta2zyBpJgHY8Y0qQUwXr00uY1Gf0wfI/k5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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