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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06980280f3e8ed225f4c629e7e34b2cb19f3eb83ff7f575bd0c0ff5ac97ba25' 
  AND token = 'Zv+dAGCKSTB7eAGMkOYxyiwPMvnNAYN+AQanlKJm27A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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