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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df052a1162291e37f740836dfbbb17e8f7423a5c51fe312db4109f62effdfb7' 
  AND token = 'lk/4SF/zc9fjT/MDJfJZ3akKEwNg8DAvKc3Thh5cz2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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