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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d7758fb7cf444ff514eaa3b04c8ee83ac774a4f498c2415b88da15f9bf23a9' 
  AND token = 'RuAjhh+ISuerY+oJzlLNsfIPIEzLAOGHuDAGg49+03o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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