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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b332e1eea431fc7608ac635df293f178127baa5a7bfa834a84bef745817fbc' 
  AND token = '+T83YGFyWy0VQ4gFo1+O94ePMYN8uFwFsf44CkMC7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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