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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469b225d7050d47f4bacf5dc4d91aacae7bec7476b4ea4cd6b8eb4c80b9c1a59' 
  AND token = 'l/3nhZNAtYA5uiIg2Ph73ogOBdxQZosygQIlbVwB6Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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