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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2dcff7716e697406891b6e9092b66a212887b8b02e1bc772facf1694ed526c' 
  AND token = 'ArXaRhryuVBJ0K4cx9TpfOHbcQorWHkYk5tia+xVVRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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