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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999ef8bcff8847ed6cf35f97d1b518055ddcf96da42851c283e0d83a196bd87d' 
  AND token = '1HXBOkJnQeCzRbvctRLNHLvZ6T7qkEigx3BeFQG0hdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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