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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6447c507460c20e4e7a57af0c789e09b6375ab9b876883887084f6b7e2f64d4' 
  AND token = 'ucsgsmo2uWpwBlnIsYHg6vKkvTff2zyyNBmHh4flQxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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