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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68305b644cc434653a283fadbce61788ec87aa17c21ffd14f9dc6d357150e78d' 
  AND token = 'D37Dm6770ghwYaepiXQUP1ZpA/VizDyXRGosdKKtL8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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