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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a828450e6c958e7fef0a8acd404658dfb66b72164e7ba6feeebd2acded9cdd' 
  AND token = 'AF8jlej4GWXR2msj2sjEGfXpQq+T1PPjdNCKxtF+8Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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