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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4badbb2722b8a59a4c197fb3c2be8bc5685fcaaefc6984b0b30351148c16bfbc' 
  AND token = 'owPOKFbOH5+PxV5hMXXjL7bdTx+uRY7Ys69V93IIE+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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