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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07dd55465696843fe6c7c9d01f6367a356ae63d6b94dd53086ff9e44e8e67ce8' 
  AND token = 'aSJ0xcWcWv3vh5Wzx8f112e3+ITvAyUo3E57CV9I+Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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