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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ec7743f17dca43177684f59e11bfede5c505db32c8b4fdec2b278d0f6ced2e' 
  AND token = 'DUWCF7J45/B3koD5v9mPsjxzrkEIxUsoADdK1C8p+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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