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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e88c5376ed60f5be6f72a5bcae645df143494efab72caeeb5025a73d1653d2' 
  AND token = 'HT8OZxpMVA1ddpVhvpWEfX0DWAXz2mmRHgHA2UU0p7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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