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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de30ea5362d7296b3a9f80b463325ec215f9c0335ccf6c48763c0dbe8b35b88e' 
  AND token = 'Ui1GyZQwNvTKJbeM0L8Wid8kZob3Trhi1dD43yVMDPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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