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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89e2dc8ec300abc99ab08b23ecd54ed5b5ce3d9731a613831dbcf7290de2c95' 
  AND token = '1DvJRojqF4dr5eZFZ2aQJQ4xbxegREoz6kRS5cOC7rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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