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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76140c1427b6ed514300a1c0f8b1d4093a08991f1f8a87d55a67ec678d57ac2' 
  AND token = 'fEwV1UIJdiwBYMdTwu/0c0nKfW+PINGQjsCeWfSMmEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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