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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b86839bc4ea1dddef6e07ed8e721e4b4d970570d7d277a55e246f0b1f8a65' 
  AND token = 'e9nzglyJMQSmQrq85+YUUmVpUTBfB/mM7VrTm8CikhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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