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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d22a1df13aec64e33f7b552d28d9b01a73cbca109c97438e345e1b487676643' 
  AND token = 'I8/36thR/vIoslV7iY8JdErya833Wiuyu2uPnXRyPKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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