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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6689996dd8495fe799687092d89942dbf6314beaa194d1613e325f314bebb681' 
  AND token = 'odWm1blM5K77I5ejm/llEXJ+LfRw2PLTp/GTjM4Y7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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