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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c8fd36e2e3e7d91a7637522432b98d536d9151ea9298cf4aa2d02f745cec0a' 
  AND token = 'gUl1m1RyEQBGyLozoEIBSbbLWyJwtfkawRkj5fUHLLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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