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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588e9336094ae007ca14cbc9b2cadff359fd0df909b72b63718c8a5443cf7bcc' 
  AND token = 'MmvEfwbkiVi4L6Viqw65uEA5At+IVUBKBGTxfqtD6xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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