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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c459109de33641bd719406c9fc8d741daf51d15336bd2b740f491b0eea576d40' 
  AND token = 'TuTrKX+49T15ojibA+w1/mqv9SVa+al9gimRbWVWay0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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