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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b292d99aff2bafdd125e3ed4a6da12f4dc8f518e74d72f041e205d8a17d4c5' 
  AND token = '6JmfxiK2dXCR2olRaKEO9+M0ft1eGUe20P/JVPWJyW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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