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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274e8d7f717fe30f1714929181a39714451d74a94f483023c3e5a48cd8b14330' 
  AND token = '2cdkU0LYG/qG0lLKSM/4a1LBcX58+256q3CfKaWh04c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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