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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989a2d992521b4504647b1b824b8e71cb461170f29248eaba8b8f2b7674d15a9' 
  AND token = 'CG9hMfubwcfJeAEDfxv1kbbMS2wMzPI7RZibXeSOKvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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