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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d91ba01f57a23367e63d925dddb568301741f81d2f9ff45385c54b14aa35d8' 
  AND token = 'XWT7Ee4TsvvE3IYI+fbBRj+hMXSDBj6CNOOYA7My9uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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