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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b2f938e680ee02cb4bd3f428bc33c1f12b528dabf988a66519195daebc2968' 
  AND token = 'ep36HZCl23x1HaMywBYIoODNh8X2wx5OOZbZ1MzemIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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