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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4244494b9a68cf8bf3118e9658a517d7f61ec792e105bc847491a9a678482b7f' 
  AND token = '88esTOAjPBV0n9RcAS5qdKJBTZ+GA6ENSkjXKWi9NEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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