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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89da4cc21c6b0ff948015a5766068439bf2e0a3108f21e613d097b8a6ff6d951' 
  AND token = 'GB/be1PFCFc7D5H5nMICcze8oBYZhc7qBZBfxfrevYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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