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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac893bcde5fb934770bc09319bec80c199fc21b821a741b2597f6c530db5750' 
  AND token = 'J6QmFhGxy5yJZYReqXh4TDZMZl5ZOeQdQZre9JAD5Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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