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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d98f00db95f00ae5c906961ced06ac12412cb9cf46e9b7304854fdb7865c471' 
  AND token = 'kIiSiJgVoad8rGhwG37y95vD6N+tmRoCkIYSURf2eZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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