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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1039a7e7371b3cc7afe38346657f541657af6f433cf7ca95e7cd330863103330' 
  AND token = 'gx4Wx/vEm6fk5Ny9efreJFmRxLgphLEuT49P+C8h6X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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