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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36861a7a4e19bb905b3b95d0bf6af0291028f0b5b974a7d25f9c0642d989665f' 
  AND token = 'RmLdOypLcjPsQRK2MXWQpdJeQYoE+rciu826itOKM0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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