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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94f6bf1f9deb285695377a98e721d87db4b58bb67c76a6a731ea57655a61238' 
  AND token = '78SE5eYh/+wgIGXKsfrfeulhep2qq/Nex4mA4zu9erU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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