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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89229fcf649c0a912b6bc67139ae5bc76c41933e6af1cd11e30ec28ac6cdc7ae' 
  AND token = 'tacHRiD99gsIgJdg1Yq+ZkoIfk3He60nQ/oltVNLQ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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