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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c9dce99919491137c7a0882cb01f249163d028c012bb5dbdfc9e631ad74858' 
  AND token = 'qW7f6Oxr+O4nsClmN8qJcGbr+EuQyf5dtV72nMF1Deo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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