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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6384ec8e3aa6c8e4965679c6c8440c9d71dc33a7ebc2719841ff4adddfc5f8c6' 
  AND token = 'S+GTuIbxCZOgNfS/0XgeI2L+cg1zqf/WM5FYGCWKnyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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