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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b943d946ecda299ca41ad33d3a90ff43f5176d1dbf6f2832891324445ec7958' 
  AND token = 'Mb+YO0HiOb/8dJPNdcjKhnsl0jYIlOdbXDGuhYd0nVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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