SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac101adddf0c04f65d45a545f1b930698c3087a40f3773c53f2f25e99ded7c14' 
  AND token = 'oj+gI79NYMnCG/8o/qOizKWBrYuyQNr4sW5cHn3hr+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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