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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c47830e3ce9a6dc81bae32d8ba203510337d67c32dd3f91d76592edab63fa4' 
  AND token = '2AUvQo1iEm/Eq6b5BAf0f72tEuG4hWalISbYtV7mU9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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