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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d928fb001429b5890f15bce2b0791a4dbc62dc5329cd89cbaaa6303f833f5bc' 
  AND token = '1elmyhwu+MgY0YnUtdetjvyJ52RBW/C3zV9sssmn058=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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