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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61b36e9f902ca4f220f9cc23387cfa2814dc22c2d181cf5de2066f2944b8c5f' 
  AND token = 'x489LZjDRnV2Od/rcNujAEDT1D7+m5QH5CbSmtK2SyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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