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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ee713939f9ebed22391526610ad0d217b1e5b67613f18e040c21ac9d436a4c' 
  AND token = 'V1jsXTsDI2trmpD9ouxrwH8z9euEjIyWB1Zn+P/E0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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