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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d827728c47530803533f6e32c791e6d8169f39d95ac793427491bec77dfe3ce' 
  AND token = 'V95Vd5UicuNIMDd60rTHeGqNdJ3GBvOcyvc7VjUcxqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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