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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7823a51c6a3f6c991ff4ab2190c910dec51d75ff52177835c8cda96b1968a9e' 
  AND token = 'TjfikDoieYvs7jumguLajTADbixH/ZendLcHnuDZMk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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