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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb85ab55c32d7f920fa3d4154cd1f8af24676d5d9aed3d9efae3d7dd34ba36e' 
  AND token = 'IQouBuU8cqSk+ZegyeQcqTEY4z0U5acTbICKy8mdb6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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