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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0303fa60df0b7e7689f3bf87914a8226fca554ba559514493c08f8cecc324811' 
  AND token = 'sY0VlIMxgscf8KGK1+CZuhFbQ9tMFY0YTz1fXH7dmF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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