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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63faf12cead08d9d8d504f87373b017433e62b5409e36c1734d5a8cbf35d9b97' 
  AND token = 'sE9EmLQT7fjORLoeubqIw1qD7pMOstqS1XbcSWuopYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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