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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0137c177024d309fba4bf78aabc04dcd89d0d04c1cdb469f95f585ee7d07e42b' 
  AND token = 'Uz5CYDct00V/UOTHVM8D6HRPE+LM3v/6rJm4nCFCQZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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