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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c94e7343d7f1d8049fc8dd637d8ae7e5295257de18e588bbb62a57ce1f433f' 
  AND token = 'iGUXkIsi4bCAXladT08r7UyTVcgoOuYtVv8RMFcXAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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