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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd72a9a74678074fa99ae2783157968152ebd10fd85f910f6c2cc411623b247' 
  AND token = 'gnjic6JdK8jf1o0T/sTx2M8lDQMxz/OuWRJwem7+vk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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