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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f3b7dccc612064f6a555792b33d4f398a6b4320674a114312284d8fd69661d' 
  AND token = 'xrxN4os0f6Hhcw/9ySEjyw4G2P+LQ2OhhXliV819a28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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