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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd3032c46d5e9cf9159ad15a658f63dd6d5d834bce9f48b44f4c2d89939dfcc' 
  AND token = 'ozenp+h9QXbjlHu6/XSrW6Y5qd/b/aTeIPpE6KSbm4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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