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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dd969fcb0a16551854e1b94f1cb43dc52979e97de92e13b9787f7a1fa9a607' 
  AND token = 'iZrmm5P+MK2mynG8BJRroxgVTgLkgkRfaKtVRnCtF80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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