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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca44bd8bd58e288a16fbc3721b544d32b87ff50e8bb0e359a9d760ae6545f766' 
  AND token = 'UQ6dEnYPsJB4rl8qDv5ns7PwNqEEQ4pxwaXaJA8sg9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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