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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e288e6a9b2655a5dc9ee551eb8a6b3d9fd81beef244428cb7e039ce26cb490f7' 
  AND token = 'CnJUBBCgDcE2WpA/XjFBceRjwyPDYMnIFoviFyiz2Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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