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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab367d9f1c7fb6152662d8bd026e4501421d63d7bff2bd08053049925fb67e5' 
  AND token = 'cINaEq3oAqCmUfKA07S3Fpif6+vTrrvSFSKa71CQRIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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