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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2358f6b6c4810db29060deb5d32b86696544e823d9f60e9c4bf4e603178ae0db' 
  AND token = 'CbC+lBajlARI6yQdaGKTZRQivcB0DkRM/NpacxDevjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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