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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca67c4f5b20d0d16e9960a7f6a1053ea10002f1ccd7ecd8efd821926c6cc8b5' 
  AND token = 'ZQb/QaY9insS1erH/GhkOZM9S7BEoTO2ZsJQVLelyNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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