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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4715a8903056b40d78eb825bab52b2b47ea5e8f92bb6faa87287460f815582' 
  AND token = 'Q+P99eiIX5qFqDLw0auwr0Bh8I36NkhKNelmn3LWDHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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