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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219ae25cd6493c4aee313c08c7f8ac40d92c90148d1a37291bd1289d381a48c2' 
  AND token = 'iasnUCW46n1IlUmQdnwAlHSNA4JknDYamW4R8L4cDzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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